All over the world, cyclists use signals as a necessary means to communicate to others there intent, road hazzards, etc. Bike hand signals and communication is essential for all bicyclists when riding solo, in groups or pace lines.
 

Handlebar Bicycle Club stresses the need for its members to know and understand the basic hand signals. Initiating and using the proper hand signals can help you avoid danger and reduce the chance of a bike crash.

The video below gives you a comprehensive overview of cycling hand signals including how and when they should be used.